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SOCIAL BEHAVIOUR AND MASS MORTALITY IN THE BASAL CERATOPSIAN DINOSAUR PSITTACOSAURUS (EARLY CRETACEOUS, PEOPLE'S REPUBLIC OF CHINA)
Author(s) -
QI ZHAO,
BARRETT PAUL M.,
EBERTH DAVID A.
Publication year - 2007
Publication title -
palaeontology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.69
H-Index - 63
eISSN - 1475-4983
pISSN - 0031-0239
DOI - 10.1111/j.1475-4983.2007.00709.x
Subject(s) - yixian formation , paleontology , cretaceous , sociality , china , geology , theropoda , body plan , extinction event , geography , biology , ecology , archaeology , demography , mesozoic , fishery , embryo , biological dispersal , population , structural basin , sociology
An exceptionally preserved herd of the ceratopsian dinosaur Psittacosaurus was recovered from the Lujiatun Beds of the Lower Cretaceous Yixian Formation, Liaoning Province, north‐east China. This specimen provides the earliest direct evidence of post‐nestling gregarious behaviour in this important dinosaur clade. The sediment in which the skeletons occur represents a lahar (volcanic mudflow), indicating that the six individuals present were entombed simultaneously during a catastrophic mass mortality event. Reconstruction of the herd age profile shows it was composed of offspring from at least two clutches, revealing that group fidelity in these dinosaurs extended beyond time spent together in the nest. This demonstrates that sociality appeared much earlier in ceratopsian evolution than is generally acknowledged and that such behaviour preceded the evolution of the elaborate horns and frills seen in derived ceratopsids.